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A prospective cohort study found that women reporting severe and/or chronic abuse of multiple types during childhood and adolescence had a 79% higher risk of laparoscopically confirmed endometriosis.

Severe abuse was defined as being kicked, bitten, punched or physically attacked more than once, or choked or burned ever, whereas severe sexual abuse was considered forced sexual activity during both childhood and adolescence.

“We saw stronger associations among women whose endometriosis was most likely diagnosed as a result of pelvic pain symptoms,” said lead author Holly Harris, ScD, an assistant professor of epidemiology at the Fred Hutchinson Cancer Research Center in Seattle, Washington.

Previous studies led by members of Dr. Harris’ research team had shown a connection between early life abuse and both uterine fibroids and hypertension. “Given recent links found between endometriosis and hypertension, one of the next logical steps was to examine the association between abuse and risk of endometriosis,” Dr. Harris told Contemporary OB/GYN.

For the study, which appeared in the journal Human Reproduction, data were collected from 60,595 premenopausal women from 1989 to 2013 as part of the Nurses’ Health Survey II cohort.

Participants completed a questionnaire on exposure to violence.

A total of 3,394 cases of endometriosis were diagnosed during 24 years of follow-up.

Overall, 34% of study participants reported moderate or severe physical abuse during early life and 11% of study participants reported forced sex, while 14% of women diagnosed with endometriosis had severe sexual abuse history.

“It is extremely important for readers, clinicians and women with or those who care about women with endometriosis to understand that these results absolutely do not imply that all women who have endometriosis have been abused,” Dr. Harris said. “Abuse in early childhood and adolescence is common among both women with and without endometriosis.”

The associations between abuse and endometriosis were stronger in women presenting without infertility. This group was also more likely to report pelvic pain.

“Sadly, childhood abuse is real, is a major public health issue, and can have long-lasting impacts on health,” Dr. Harris said. “In addition, for women with pelvic pain with or without endometriosis, it is important that they know that these symptoms are not normal.”

When these women raise concerns about their pain with clinicians, they should not be dismissed, no matter their age or history, according to Dr. Harris. “There is a growing body of evidence that pain sensitization can result from a physiologic response to the stress and trauma of abuse,” she said. “This occurs not only among women with endometriosis but also among women with other pain conditions.”